New layer at -> doubled places

Posted by stephan75 on 31 May 2012 in English (English)

According to our wiki about Quality Assurance, one fine instrument is the web service KeepRight.

Recently a new layer was added, called "doubled places".

With this you can find POIs or amenities that seem to be double mapped by a single node with its tags and additionally with an area often tagged also with "building=yes" and same or similar tags like the single node.

If you enter the KeepRight site, do not be irritated by the many markers that are switched on by default. You can switch off all at once and then activate the error layer that might be interesting for you, especially the newly introduced doubled places.

If you want to verify or correct some errors via the JOSM editor, I can recommend to have the "remote" feature switched on in JOSM's settings. Thus you can easily click the "JOSM" button at each error on Keppright map to work with and have JOSM started in the background.

Feedback about success in bug squashing or failure is appreciated :-)



If you combine two OSM POI objects to one, please pay attention whether there is one of them that will be deleted when the ODbL change is coming. Best way is to use the according licence change plugin within JOSM!!!

Comment from Vincent de Phily on 1 June 2012 at 10:37

Nice, it's going to be usefull.

One false-positive I'm seeing all around though: in a residential area or commercial area, it is common (and correct) to have the street named the same as the area. There's also the case of "name=Foobar House" which is arguably both the name of the building and the area around it.

Not sure how to remove those false-positive without creating false-negatives, though.

Comment from dcp on 1 June 2012 at 15:24

Thank-you for mentioning keep-right. It is a very useful tool. All contributers (both old and new) should check their work (and that of others) using keep-right and: OpenStreetMap-Inspector (OSMI) is another powerful tool which helps us to raise the quality of the OSM-Databank. Check it out, use it and don't have any qualms about correcting other contributions: We are not competing against each other but giving up our time for the benefit of all! One word of warning, though; don't change complex structures that you don't technically understand or don't have the local knowledge to correct: Contact the contributer in question (i.e. the one with the longest experience within the area in question and ask him/her to look at it. It usually works this way but you might get a rude answer back. Don't worry, be happy, leave the problem for someone else to solve and move on. There is still a lot of work to do!

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